| /* |
| * affine.h -- Affine Transforms for 2d objects |
| * Copyright (C) 2002 Charles Yates <charles.yates@pandora.be> |
| * Portions Copyright (C) 2003 Dan Dennedy <dan@dennedy.org> |
| * |
| * This program is free software; you can redistribute it and/or modify |
| * it under the terms of the GNU General Public License as published by |
| * the Free Software Foundation; either version 2 of the License, or |
| * (at your option) any later version. |
| * |
| * This program is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| * GNU General Public License for more details. |
| * |
| * You should have received a copy of the GNU General Public License |
| * along with this program; if not, write to the Free Software Foundation, |
| * Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. |
| */ |
| |
| #ifndef _AFFINE_H |
| #define _AFFINE_H |
| |
| #include <math.h> |
| |
| /** Affine transforms for 2d image manipulation. Current provides shearing and |
| rotating support. |
| */ |
| |
| typedef struct { |
| double matrix[2][2]; |
| } affine_transform_t; |
| |
| void affine_transform_init( affine_transform_t *this ); |
| void affine_transform_rotate( affine_transform_t *this, double angle ); |
| void affine_transform_shear( affine_transform_t *this, double shear ); |
| void affine_transform_scale( affine_transform_t *this, double sx, double sy ); |
| double affine_transform_mapx( affine_transform_t *this, int x, int y ); |
| double affine_transform_mapy( affine_transform_t *this, int x, int y ); |
| void affine_scale( const unsigned char *src, unsigned char *dest, int src_width, int src_height, int dest_width, int dest_height, int bpp ); |
| |
| #endif |
| |
